# Thor (1966) #163

Published: 1969-04-01T00:00:00+0000
Series: Thor (1966 - 1996)
Creators: Stan Lee (writer), Jack Kirby (penciler), Vince Colletta (cover artist), Sam Rosen (letterer)

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When Sif goes missing during a mission on Earth, Thor investigates. What the Thunder God uncovers disturbs him greatly; an atomic research site has been infiltrated by mutated beings. Is Lady Sif's disappearance connected to this strange event? Enter Pluto, the Roman god of Death!